[cmake-developers] CMake API for warnings

[Geoffrey Viola]

CMake should support an API to manage compiler warnings to simplify a common problem. Using more compilers with high levels of warnings means cheap static analysis and better conformance to standard C++.

Compiler warnings are an easy way to increase program reliability. A use case would be to increase compilation warnings on all internal code, ignore warnings on all 3rd party code, and treat all warnings as errors.

Attached is an initial attempt to control warnings in CMake. The API has a short name (e.g. set_warnings_as_errors) for simplicity and a more technical name (e.g. set_warnings_as_errors_folder) to specify scope. Note that the short name acts on CMake's folder scope and is meant to be global. The current compilers considered are GCC, clang, Green Hills, and MSVC. A CMake Warning is issued if the macro does not support a specific compiler so that conformance can be guaranteed.

Thanks,
Geoffrey Viola
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